Icom IC-703 Service Manual
  1. Manuals
  2. Brands
  3. Icom Manuals
  4. Transceiver
  5. IC-703
  6. Service manual

Icom IC-703 Service Manual

Hf/ 50mhz all mode transceiver
Hide thumbs Also See for IC-703:
Table of Contents

Advertisement

Quick Links

See also: Instruction Manual
SERVICE
MANUAL
HF/ 50MHz ALL MODE TRANSCEIVER
i703

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the IC-703 and is the answer not in the manual?

Questions and answers

Related Manuals for Icom IC-703

Summary of Contents for Icom IC-703

  • Page 1 SERVICE MANUAL HF/ 50MHz ALL MODE TRANSCEIVER i703...
  • Page 2 This service manual describes the latest service information NEVER connect the transceiver to an AC outlet or to a DC for the IC-703 HF/50MHz ALL MODE TRANSCEIVER. power supply that uses more than 16 V. This will ruin the transceiver.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2 INSIDE VIEWS SECTION 3 CIRCUIT DESCRIPTION 3 - 1 RECEIVER CIRCUITS ............3 - 1 3 - 2 TRANSMITTER CIRCUITS .

  • Page 4: Specifications

    SECTION 1 SPECIFICATIONS I GENERAL I RECEIVER • Frequency coverage • Receive system : Double superheterodyne Receive 0.030 – 60.000 MHz* • Intermediate frequencies : 1st IF; 64.455 kHz, 2nd IF; 455 kHz Transmit 1.800 – 1.999 MHz* • Receive sensitivity (Pre-amp.

  • Page 5: Display Board

    SECTION 2 INSIDE VIEWS • DISPLAY BOARD Sub CPU Sub CPU LCD driver LCD driver (IC6: HD6473847RH) (IC6: HD6433842RB27H) (IC2: SED1522F0C) (IC2: SED1522F0C) SW LED dimmer SW LED dimmer Back light dimmer Back light dimmer Q50: 2SB1132 Q50: 2SB1132 Q2: 2SB1132 Q2: 2SB1132 Q51: 2SC4081 Q51: 2SC4081...
  • Page 6 • MAIN UNIT 2nd mixer 2nd mixer (D901: HSB88WS) (D901: HSB88WS) Noise blancer circuit Noise blancer circuit YGR amplifier YGR amplifier (IC101: PC2709T) (IC101: PC2709T) 2nd IF amplifier 2nd IF amplifier 1st IF filter 1st IF filter (Q1401: 3SK294) (Q1401: 3SK294) (FI851: FL-348) (FI851: FL-348) 2nd IF filter...

  • Page 7: Receiver Circuits

    7 low-pass filters as below, the transmit/ 3-1-2 PREAMPLIFIER CIRCUIT (MAIN UNIT) receive switching relay (PA unit; RL250) and low-pass filter The preamplifier circuit in the IC-703 has approx. 15dB gain (PA unit; L300, L301, C304–C308), and are then applied to over a wide-band frequency range.
  • Page 8 IF, frequency is corrected at the detector. applied to the 2nd IF circuit. In the IC-703, the 1st LO frequency is shifted to change the 2nd IF because a fixed 2nd LO frequency (64 MHz) is used. 3-1-7 2ND IF CIRCUIT (MAIN UNIT) The 1st IF filter (FI1301) and 2nd IF filter (FI1501) have 15 The 2nd IF circuit amplifies and filters the 2nd IF signals.

  • Page 9: Display Board

    3-1-9 AGC CIRCUIT (MAIN UNIT) In SSB/CW/RTTY modes, the S-meter signal is applied to the main CPU (IC5901, pin 36) and is compared with the The AGC (Automatic Gain Control) circuit reduces IF ampli- threshold level set by the [RF/SQL] control. The [RF/SQL] fier gain to keep the audio output at a constant level.

  • Page 10: Transmitter Circuits

    3-1-13 AF SELECTOR SWITCH (MAIN UNIT) Audio signals from the front or rear panel [MIC] connector enter the microphone amplifier IC (IC1621, pin 12) and are The AF signals from one of the detector circuits are applied then amplified at the microphone amplifier or speech com- to the AF selector switch (IC2301).
  • Page 11 IC1801 is a double balanced mixer IC and outputs a double 3-2-6 RF CIRCUIT (MAIN AND PA UNITS) side band (DSB) signal with –40 dB of carrier suppression. The RF circuit amplifies the displayed frequency signal to R1803 and R1807 adjust the balanced level of IC1801 for obtain 10 W of RF output power for HF/50 MHz bands.
  • Page 12 When the “FORL” voltage exceeds the “POCV” voltage, ALC The reflected wave signal appears and increases on the bias voltage from IC2701 (pin 1) controls 1st and 2nd IF antenna connector when the antenna is mismatched. The amplifiers (Q831, Q1401). This adjusts the output power to HF/50 MHz reflected signal level is detected at D561 (PA the level determined by the RF power setting until the unit), and is amplified at the APC amplifier (IC2701) and...

  • Page 13: Pll Circuits

    (2) ALC meter 3-3-3 2ND LO AND REFERENCE OSCILLATOR The ALC bias voltage from IC2701 pin 14 is applied to the CIRCUITS (MAIN UNIT) main CPU (IC5901) via the “ALCV” signal line for indicating The reference oscillator (IC9601, Q9621, X9501) generates the ALC level.
  • Page 14 3-4-2 OUTPUT POWER DETECTING CIRCUIT The output side signal is applied to the amplifiers (Q643, Q811). The amplified signal is applied to the phase detect- (PA UNIT) ing circuit (L641). The output power from the power amplifier (Q200, Q201) is The detected signal is applied to the comparator circuit divided at the C640 and C641.

  • Page 15: Front Unit.

    3-5 POWER SUPPLY CIRCUITS 3-6 CPU PORT ALLOCATIONS 3-5-1 VOLTAGE LINES (MAIN UNIT) 3-6-1 MAIN CPU PORT ALLOCATIONS (MAIN UNIT; IC5901) Description Line Port Common 3 V converted from the HV line by the Description number name +3 regulator circuit (IC9901). Outputs beep audio and CW side tone BEEP Common 3 V converted from the 14V line by the...

  • Page 16: Main Unit;

    (MAIN unit; IC5901)–Continued (MAIN unit; IC5901)–Continued Port Port Description Description number name number name Outputs the speaker switching signal. Outputs strobe signal to the BFO’s SBST DDS IC (IC9701). High : The speaker is ON. Outputs strobe signal to the DDS IC Input port for supplied voltage detect- PDST VCCL...
  • Page 17 3-6-2 SUB CPU PORT ALLOCATIONS (DISPLAY BOARD; IC6) (DISPLAY BOARD; IC6)–Continued Port Port Description Description number name number name Output key backlight control signals. Outputs the communicating signal with LTXD the main unit. KL1S KL2S Lights KL1S Input port for the sub-dial’s B phase SDBK signal.

  • Page 18: Preparation Before Servicing

    SECTION 4 ADJUSTMENT PROCEDURES 4-1 PREPARATION BEFORE SERVICING I REQUIRED TEST EQUIPMENT EQUIPMENT GREDE AND RANGE EQUIPMENT GREDE AND RENGE Output voltage : 13.8 V DC Frequency range : 1 kHz ±10 % DC power supply Distortion meter Current capacity : 5 A or more Measuring range : 1–100 %...

  • Page 19: Pll Adjustments

    4-2 PLL ADJUSTMENTS ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST • Display frequency: Any MAIN Connect an RF volt- 1.5–3.5 V MAIN Verify REFERENCE FREQUENCY • Receiving meter to check point CP9611. Connect a frequency 64.000000 MHz R9552 counter check...
  • Page 20 • MAIN UNIT TOP VIEW CP9671 CP9611 Reference frequency check point R9552 Reference frequency adjustment C9202 VCO1 lock voltage adjustment C9252 VCO2 lock voltage adjustment CP9151 VCO1 and VCO2 lock voltage check point 4 - 3...

  • Page 21: Transmitter Adjustments

    • Pre-set R2765 to 9 o’clock posi- Rear Connect an ammeter 3.0 A MAIN R2765 tion. panel between the IC-703 • Display frequency: 3.8000 MHz and the power sup- • Mode : LSB ply. • Connect CP2711 to ground. • Connect an audio generator to [MIC] connector and set as: 1.5 kHz/30 mV...
  • Page 22 • MAIN UNIT TOP VIEW R1203 R1203 R833 Transmit peak power Transmit total gain adjustment adjustment R1807 R1803 R2765 Carrier suppression Id APC adjustment adjustment R2705 R2706 Output power adjustment 4 - 5...
  • Page 23 TRANSMITTER ADJUSTMENTS (continued) ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST • Display frequency: 29.10000 MHz Rear Connect an FM devi- ±4.5 kHz MAIN R2621 DEVIATION • Mode : FM Panel ation meter to [ANT] • [RF POWER] connector •...
  • Page 24 • MAIN UNIT TOP VIEW R2707 R2618 R1811 AM modulation adjustment R1853 CW carrier level adjustment R2621 FM deviation adjustment 4 - 7...

  • Page 25: Receiver Adjustments

    4-4 RECEIVER ADJUSTMENTS ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST RECEIVER • Display freq. : 14.15000 MHz Rear Connect an AC milli- Maximum AF output MAIN L881, PEAK • Mode : USB Panel voltmeter to the [EXT level L882, SP] jack with an 8 Ω...
  • Page 26 • MAIN UNIT TOP VIEW R1203 Receiver total gain adjustment L1053 L1052 Noise blanker adjustment L1102 L1101 L1201 L882 L881 Receiver peak adjustment 4 - 9...

  • Page 27: Set Mode Adjustments (No.1)

    4-5 SET MODE ADJUSTMENTS (No.1) ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION • Enter adjustment set mode: Push [F-2 (RX)] to enter the S- ENTERING METER adj. setting mode, [F-3 (TX)] ADJUSTMENT 1 Turn power OFF. SET MODE to enter the TX adj. setting mode. 2 Terminate the [REMOTE] jack with a 3.5(d) mm shorten-plug.
  • Page 28 SET MODE ADJUSTMENTS (No.1)–Continued ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION HF ALC • Connect an RF power meter to [ANT] con- Push and hold [MENU] to set ALC ALC METER (HF bands) nector. reference level while transmitting. • Connect an audio generator to [MIC] con- nector and set as : Level : 1.5 kHz/30mV...

  • Page 29: Pa Unit Adjustments

    4-6 PA UNIT ADJUSTMENTS ADJUSTMENT MEASUREMENT POINT ADJUSTMENT ADJUSTMENT CONDITION VALUE UNIT LOCATION UNIT ADJUST • Turn R159, R164 (on the PA unit) to Connect digital 0.5 V R150 IDLING CURRENT maximum counterclockwise posi- multimeter to check tion. point CP151. •...
  • Page 30 • PA UNIT TOP VIEW R164 R159 Idling current adjustment CP41 SWR detection J640 check point J642 C561 J641 SWR detection Antenna tuner adjustment adjustment plug replacement point 4 - 13...

  • Page 31: Set Mode Adjustments (No.2)

    4-7 SET MODE ADJUSTMENTS (No.2) ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION • Enter tuner adjustment set mode: Push [F-1 (TUN)] to enter the anten- ENTERING ADJUSTMENT 1 Turn power OFF. na tuner adj. setting mode. SET MODE 2 Terminate the [REMOTE] jack with a Then advance to the following set- 3.5(d) mm shorten-plug.

  • Page 32: Display Unit

    SECTION 5 PARTS LIST [VR UNIT] [DISPLAY UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7210002780 VARIABLE RV-300 (RK0972210) 10KB/10KB 1750000370 S.DIODE DA221 TL 7210002940 VARIABLE TP96D231E20-20F-10KB-1897 1750000370 S.DIODE DA221 TL 1750000370 S.DIODE DA221 TL 1790001250 S.DIODE MA2S111-(TX) 6510018890 S.CONNECTOR 52559-1390 1790001250 S.DIODE MA2S111-(TX) 1160000140 S.DIODE DAP222 TL...
  • Page 33 [DISPLAY UNIT] [DISPLAY UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) 4550002980 S.TANTALUM TEMSVA 1C 225M-8L ERJ3GEYJ 681 V (680 Ω) 7030003420 S.RESISTOR 4030011600 S.CERAMIC C1608 JB 1E 104K-T 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) 4550002980 S.TANTALUM TEMSVA 1C 225M-8L 7030003540 S.RESISTOR...
  • Page 34 [PA UNIT] [PA UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 1180002010 S.REG BA08FP-E2 D500 1160000070 S.DIODE DAN202K T146 IC560 1110002700 S.IC NJM2904M-TE1 D501 1160000070 S.DIODE DAN202K T146 IC600 1140010671 S.IC ISPLSI2064VE-100LT100 I002 A only D520 1160000070 S.DIODE DAN202K T146 IC601 1130006800 S.IC TC7W08F (TE12L) A only D521...
  • Page 35 [PA UNIT] [PA UNIT] ORDER ORDER DESCRIPTION DESCRIPTION MCR10EZHJ 1 Ω (010) L642 6180003310 COIL LR-436 R203 7030000020 S.RESISTOR MCR10EZHJ 1 Ω (010) L644 6200005010 S.COIL NL 252018T-100J R204 7030000020 S.RESISTOR MCR10EZHJ 33 Ω (330) L645 6200005010 S.COIL NL 252018T-100J R205 7030000200 S.RESISTOR MCR10EZHJ 33 Ω...
  • Page 36 [PA UNIT] [PA UNIT] ORDER ORDER DESCRIPTION DESCRIPTION MCR10EZHJ 39 Ω (390) R508 7030000210 S.RESISTOR R681 7030003730 S.RESISTOR ERJ3GEYJ 274 V (270 kΩ) MCR10EZHJ 39 Ω (390) R509 7030000210 S.RESISTOR R682 7030003610 S.RESISTOR ERJ3GEYJ 273 V (27 kΩ) ERJ3GEYJ 470 V (47 Ω) R520 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ)
  • Page 37 [PA UNIT] [PA UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R813 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) 4030006850 S.CERAMIC C1608 JB 1H 471K-T R814 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) 4030006880 S.CERAMIC C1608 JB 1H 472K-T R815 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) 4030011600 S.CERAMIC C1608 JB 1E 104K-T R816...
  • Page 38 [PA UNIT] [PA UNIT] ORDER ORDER DESCRIPTION DESCRIPTION A only C428 4030006880 S.CERAMIC C1608 JB 1H 472K-T C533 4030006880 S.CERAMIC C1608 JB 1H 472K-T C429 4030006880 S.CERAMIC C1608 JB 1H 472K-T A only C534 4030006880 S.CERAMIC C1608 JB 1H 472K-T C430 4030006880 S.CERAMIC C1608 JB 1H 472K-T...
  • Page 39 [PA UNIT] [PA UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C713 4030006880 S.CERAMIC C1608 JB 1H 472K-T C877 4030018350 S.CERAMIC GRM31A5C2J151JW01D C714 4030006880 S.CERAMIC C1608 JB 1H 472K-T C878 4030018350 S.CERAMIC GRM31A5C2J151JW01D C715 4030006880 S.CERAMIC C1608 JB 1H 472K-T C879 4030018340 S.CERAMIC GRM31A5C2J331JW01D C716 4030006880 S.CERAMIC...
  • Page 40 [PA UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION W421 7030000010 S.JUMPER MCR10EZHJ JPW (000) IC2301 1130007820 S.IC BU4052BCF-T1 W440 7030000010 S.JUMPER MCR10EZHJ JPW (000) IC2401 1110002680 S.IC NJM2902M-T1 W441 7030000010 S.JUMPER MCR10EZHJ JPW (000) IC2461 1130005640 S.IC TC4W53F (TE12L) W460 7030000010 S.JUMPER MCR10EZHJ JPW (000) IC2651 1130005640 S.IC...
  • Page 41 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION Q1301 1590001870 S.TRANSISTOR DTA114EE TL Q9960 1560001260 S.FET 2SK3018 T106 Q1302 1590001870 S.TRANSISTOR DTA114EE TL Q9963 1590001870 S.TRANSISTOR DTA114EE TL Q1303 1590001870 S.TRANSISTOR DTA114EE TL Q9964 1590001870 S.TRANSISTOR DTA114EE TL Q1304 1590001870 S.TRANSISTOR DTA114EE TL Q9965 1560001260 S.FET 2SK3018 T106 Q1305 1560001260 S.FET...
  • Page 42 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION A only D2704 1790001250 S.DIODE MA2S111-(TX) L524 6200002840 S.COIL NL 252018T-R22J D2705 1160000140 S.DIODE DAP222 TL A only L525 6200002640 S.COIL NL 252018T-R15J D2741 1160000140 S.DIODE DAP222 TL A only L526 6200005010 S.COIL NL 252018T-100J D2781 1790001330 S.ZENER...
  • Page 43 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION L6804 6180003290 COIL BM27-400-6A R412 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) L6828 6910003570 COIL 2943-666663 R413 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) L6951 6180003290 COIL BM27-400-6A R415 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) L6953 6180003290 COIL BM27-400-6A...
  • Page 44 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION ERJ3GEYJ 101 V (100 Ω) R842 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R1343 7030003320 S.RESISTOR R843 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R1344 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) R844 7510001540 S.THERMISTOR NTCG16 4BH 332KT R1361...
  • Page 45 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION ERJ3GEYJ 821 V (820 Ω) R1725 7030003430 S.RESISTOR R2452 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R1751 7030003480 S.RESISTOR ERJ3GEYJ 222 V (2.2 kΩ) R2453 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R1801 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ)
  • Page 46 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R2742 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) R5806 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R2743 7030003680 S.RESISTOR ERJ3GEYJ 104 V (100 kΩ) R5807 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) R2744 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ)
  • Page 47 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION R6661 7030003640 S.RESISTOR ERJ3GEYJ 473 V (47 kΩ) R9053 7030003440 S.RESISTOR ERJ3GEYJ 102 V (1 kΩ) ERJ3GEYJ 101 V (100 Ω) R6662 7030003620 S.RESISTOR ERJ3GEYJ 333 V (33 kΩ) R9054 7030003320 S.RESISTOR R6663 7030003580 S.RESISTOR ERJ3GEYJ 153 V (15 kΩ)
  • Page 48 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION 4030011600 S.CERAMIC C1608 JB 1E 104K-T C594 4030007140 S.CERAMIC C1608 CH 1H 121J-T 4030011600 S.CERAMIC C1608 JB 1E 104K-T C595 4030011340 S.CERAMIC C1608 CH 1H 471J-T 4030006860 S.CERAMIC C1608 JB 1H 102K-T C596 4030007170 S.CERAMIC C1608 CH 1H 221J-T...
  • Page 49 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C884 4030011600 S.CERAMIC C1608 JB 1E 104K-T C1682 4030011340 S.CERAMIC C1608 CH 1H 471J-T C885 4030006880 S.CERAMIC C1608 JB 1H 472K-T C1701 4510004630 S.ELECTROLYTIC ECEV1CA100SR C886 4030007030 S.CERAMIC C1608 CH 1H 150J-T C1702 4030011600 S.CERAMIC C1608 JB 1E 104K-T...
  • Page 50 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C2705 4030011600 S.CERAMIC C1608 JB 1E 104K-T C6702 4030006880 S.CERAMIC C1608 JB 1H 472K-T C2781 4510004440 S.ELECTROLYTIC ECEV1HA010SR C6703 4030006880 S.CERAMIC C1608 JB 1H 472K-T C2791 4030011600 S.CERAMIC C1608 JB 1E 104K-T C6704 4030006880 S.CERAMIC C1608 JB 1H 472K-T...
  • Page 51 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION C7210 4550006080 S.TANTALUM TEMSVB2 1C 106M-8L C9504 4030006880 S.CERAMIC C1608 JB 1H 472K-T C7211 4510004630 S.ELECTROLYTIC ECEV1CA100SR C9521 4030006980 S.CERAMIC C1608 CH 1H 070D-T C7301 4510004630 S.ELECTROLYTIC ECEV1CA100SR C9522 4030009520 S.CERAMIC C1608 CH 1H 020B-T C7302 4510004630 S.ELECTROLYTIC ECEV1CA100SR C9523...
  • Page 52 [MAIN UNIT] [MAIN UNIT] ORDER ORDER DESCRIPTION DESCRIPTION J5101 6510023460 S.CONNETOR 08FMN-BMTTR-A-TBT EP6826 6910012350 S.BEAD MMZ1608Y 102BT J5901 6510022620 S.CONNECTOR 10FMN-BMTTR-A-TBT EP6827 6910012350 S.BEAD MMZ1608Y 102BT J6701 6510022650 S.CONNECTOR 18FMN-BMTTR-A-TBT EP6851 6910012350 S.BEAD MMZ1608Y 102BT J6751 6510022650 S.CONNECTOR 18FMN-BMTTR-A-TBT EP6852 6910012350 S.BEAD MMZ1608Y 102BT J6801 6510016170 CONNECTOR...
  • Page 53 SECTION 6 MECHANICAL PARTS AND DISASSEMBLY [CHASSIS UNIT] [FRONT UNIT] REF. ORDER REF. ORDER DESCRIPTION QTY. DESCRIPTION QTY. 6510000370 Antenna connector MR-DS 0880001360 EX-2500 #02 8900011980 Cable OPC-1214 8900006040 Flat cable OPC-593 8900011980 Cable OPC-1214 8900006251 Cable OPC-610A 8900011970 Cable OPC-1213 8210019400 2177 front panel (A)-1 assembly 880001250...

  • Page 54: Jack Board]

    MP403 8930008680 Insulation plate (AH) MP900 8950000180 Cable tie-80 REF. ORDER DESCRIPTION QTY. MP901 8950000180 Cable tie-80 8970024110 ICOM shield (B) [ACCESSORIES] J6801 6510016170 Connector 52018-8835 (MIC) J6851 6450001840 Connector TCS7568-43-201 (DATA) REF. ORDER DESCRIPTION QTY. J6901 6450000140 Connector HSJ0807-01-010 (REMOTE)
  • Page 55 MP10 (F) MP11 (F) MP4 (F) IC-703 MODE RF/SQL HF/50MHz TRANSCEIVER BAND POWER P.AMP/ATT VFO A 60dB RIT/ TUNER MP18 (F) M1 SPL A/B A=B DISPLAY M-CH SHIFT PHONES LOCK MP12 (F)+MP21 (F) J2 (D) BAND MENU MP26 (F) MP11 (F)
  • Page 57 S-13912HZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan C 2003 Icom Inc.
  • Page 58 MP9625 (M) MP9624 (M) MP30 (C) EP1 (C) MP9700 (M) W7 (C) MP9701 (M) W8 (C) MP9702 (M) MP9961 (M) MP701 (M) SP1 (C) MP32 (C) MP15 (C) MAIN UNIT MP21 (C) MP9621 (M) MP29 (C) MP5901 (M) MP9703 (M) MP9201 (M) MP2 (F) MP23 (F)
  • Page 59 SECTION 7 SEMI-CONDUCTOR INFORMATION • TRANSSISTORS AND FET’S • DIODES 2SA1162 GR 2SA1576A T106 R 2SB1132 T100 Q 2SB1132 T100 R 2SB1143 S 1SS355 1SS372 1SS385 1SV271 DA221 TL (Symbol: SG) (Symbol: FR) (Symbol: BAQ) (Symbol: BAR) (Symbol: B1143) (Symbol: A) (Symbol: N9) (Symbol: 09) (Symbol: TG)
  • Page 60 SECTION 8 BOARD LAYOUTS 8-1 DISPLAY BOARD • TOP VIEW MODE POWER P.AMP/ATT TUNER/CALL RIT/SUB DISPLAY LOCK MENU PHONES 8-2 JACK BOARD • TOP VIEW to MAIN unit J5101 8 - 1...
  • Page 61 • BOTTOM VIEW (DISPLAY BOARD) to FRONT unit EP1 to JACK board to FRONT unit W2 8-3 VR BOARD • BOTTOM VIEW (JACK BOARD) RF/SQL PHONES SPEAKER PWRK to VR board J1 MICE to DISPLAY board to DISPLAY LTXD board J3 LRXD SHIFT M-CH...
  • Page 62 8-4 MAIN UNIT • TOP VIEW J6751 J6701 to PA unit J300 to PA unit J41 to PA unit J1 to PA unit J100 J5101 to JACK board J1 J2453 J6801 DRES MUDL DINT DSTB SEND MICE DSPS SQLS 10 6 to UT-106 REMOTE J7372...
  • Page 63 • BOTTOM VIEW (MAIN UNIT) 8 - 4...
  • Page 64 8-5 PA UNIT • TOP VIEW CHASSIS J1 to MAIN unit J1 to MAIN unit J2 to DC power J900 to TUNER to MAIN unit J6751 to MAIN unit J6701 8 - 5...
  • Page 65 • BOTTOM VIEW (PA UNIT) 8 - 6...
  • Page 66 SECTION 9 BLOCK DIAGRAM CHASSIS UNIT ANTENNA FI1501 D901 Q831 IC101 Q101 Q150 Q200/Q201 D560/D561 RL640 RL641 CFWS455E HSB88WS 3SK294 D701 60MHz PC2709T 2SK3074 RD01MUS1 RD07MVS1 RL250 MA732 0.1-2MHz D1401 30dB D1403 D804 D802 HSB88WS RL400 RL401 D863 D861 D602 D601 D542 D541...
  • Page 67 SECTION 10 WIRING DIAGRAMS JACK VR BOARD J100 W3, W4 (CHASSIS) BOARD W9 (CHASSIS) J5101 LRXD LRXD J300 W5, W6 (CHASSIS) LTXD LTXD POWER J6701 MICE MICE W7 (CHASSIS) PWRK PWRK chassis J900 J901 PA UNIT POWS POWS TUNER E14V EGND TPWR TPWR...
  • Page 68 SECTION 11 VOLTAGE DIAGRAMS 11-1 FRONT UNIT R1 RV-300 VR BOARD JACK BOARD LRXD DAP222 (AF) LTXD R8 18k PRAK PRAK R20 10k S3 SKQHFC MICE R123 (RF/SQL) MENK PWRK (MENU) R124 S4 SKQHFC P.AMP R125 (RIT) /ATT (F-1) R126 (SHIFT) LS22BB-2SD-PG-T PRED...
  • Page 69 11-2 MAIN UNIT MAIN UNIT(1) J5101 BUS LINE1 LRXD EP5001 LRXD EP101 LTXD EP5002 LTXD EP5003 to JACK board J1 MICE MICE L5004 MA77 ATT OFF: 0V LR-270 [EUR],[USA],[KOR]only ON: 13.0V PWRK PWRK C513 L5006 TX: 6.1V TX: 6.9V ATON BM27-400-6A RX: 0V RX: 13.1V...
  • Page 70 MAIN UNIT(2) BUS LINE1 BUS LINE1 R801 L801 R802 0.27 R813 EP812 C861 TX: 0V D803 C801 C802 R811 D861 R862 D863 RX: 0.55V Q652 MA77 Q752 0.001 MA77 MA77 EP901 XP4311 FI851 DTA114EE FL-348 D901 D804 L851 L852 D862 D864 L901 L902...
  • Page 71 MAIN UNIT(3) BUS LINE1 BUS LINE1 C1801 IC1751 IC1801 R1805 C1802 L1801 TC4W53F TA4107F IC1601 C1721 R1721 C1723 M5282FP R1701 470k 100k R1702 470k VCC2 R1811 R1818 R1703 470k R1751 RV-156 VCAOUT R1704 470k 2.2k C1609 R1609 R1705 470k 6.8k VCAIN R1803 Q1721...
  • Page 72 MAIN UNIT(4) BUS LINE1 BUS LINE1 _DSPS _DSPS R4002 _D96S _D96S 8.2k D4001 R4001 _COMS _COMS _POWS R6001 POWS MA2S111 _PRES R5804 PRES _TPWR R6003 TPWR IC4001 TC7W04F _PROS R5805 PROS _TDTS D6001 MA2S111 R6004 TDTS Q4001 _ATTS R5806 ATTS Q5851 COMS _TOE...
  • Page 73 MAIN UNIT(5) BUS LINE1 BUS LINE1 50MHz band: 1.2V HF band: 1.75V RX:7.7V OTHER band: 4.9V OTHER band: 2.8V BUS LINE6 R9205 L9203 1812CS RX: 4.6V [EUR],[USA],[KOR]only Q9964 L9202 R9401 C9406 L9403 C9407 C9409 R9403 DTA114EE Q9221 E544GN-110248 2SC4081 IC9001 IC9101 AD9833BRM MC145170D2R2...
  • Page 74 MAIN UNIT(6) BUS LINE1 J6701 START R6704 START BUS LINE6 R6703 TPWR R6702 TPWR POWS R6701 POWS IC9801 TC74HCT7007AF to PA PDT5 PDST unit J1 DST5 PCK5 P2ST PMST SST5 PST5 PBST BST5 Q9801 XP4311 J6751 D9801 DAP222 R6751 R6752 R6753 R6754 TDTS...
  • Page 75 11-3 PA UNIT PA UNIT(1) EXC-ELDR25C IT8V EXC-ELDR25C IT3V EXC-ELDR25C IT8V RL PWRS L402 R201 R210 R449 39 RX: 13.7V R202 R153 560 R448 RX: 7.9V Q200 7M(3) RL440 ATX222 RL441 ATX222 TX: 0.45V RD07MVS1 RX: 0V Q150 R104 C151 TX: 2.1V RD01MUS1 2.7k...
  • Page 76 PA UNIT(2) IT8V IT8V IT3V IT3V IT8V RL L560 LR-391 R565 47 Q700 Q701 Q702 Q703 Q704 Q705 Q706 Q707 Q708 Q709 UM5K1N UM5K1N UM5K1N UM5K1N UM5K1N UM5K1N UM5K1N UM5K1N UM5K1N UM5K1N W562 10mS or more 3.1V C565 C568 470p 470p C566 Q800...
  • Page 77 PA UNIT(3) IT8V chassis IT8V IT3V PLD moving: 3.0V un-moving: 0V IT3V_ I/057 I/058 I/038 I/059 I/037 I/036 R611 1k I/060 I/061 I/035 MCK_ I/062 I/034 MDT_ I/063 I/033 I/032 C602 0.1 RESET C609 0.1 IC600 R601 10k G0E1 ISPLSI2064VE-100LT100 G0E0 R606 BSCAN...

This manual is also suitable for:

I703Ic-i703

Table of Contents